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Name: Sand Timer
Compatibility: iPhone, iPod touch, and iPad. Requires iOS 4.0 or later.
When you're maintaining a balance between teacher talking time and student activities, and have a number of tasks to plough through in an hour, sometimes lessons threaten to overrun or you may need to think on your feet to spend extra -- or less -- time explaining subjects.
Lessons are rarely completed to the exact times noted down in your plan, so why not use a free timer to try and keep things on track?
Via: Apple App Store